Sofa



FIG. 1 is a front, upper perspective view of a sofa, showing my new design.

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a right side elevational view thereof, the left side being a mirror image thereof. 

The ornamental design for a sofa, as shown and described. 